JSFiddle - React, Tailwind, and code Playground

HTML

<div class="flex">
    <div class="b1">
        <p>1</p>
    </div>
    <div class="b2">
        <p>2</p>
    </div>
    <div class="b3">
        <p>3</p>
    </div>
</div>

CSS

.flex {
    display: -webkit-flex;
    -webkit-flex-direction: column-reverse;
    -webkit-flex-wrap: wrap;
    -webkit-justify-content: flex-end;
    -webkit-align-content: flex-start;
}

.b1, .b2, .b3 {
    width: 100%;
    margin: 5px 0;
}

.b1 p, .b2 p, .b3 p {
    margin: 0;
    padding: 5px;
    border: red 3px solid;
    background: pink;
}